Insulator.



' i113 QGUTHRIE.

INSULATOR.

APPLICATION FILED JULY24, 1911.

Patented Apr. 2, 1912.

2 sans-1841mm 1.

- J. A. GUTHRIE. INSULATOR.

APPLICATION FILED JULY 24,1911.

1,022,026. Patented Apr. 2,1912.

2 SHEETS-SHEET 2.

UNITED STATES "PATENT. orrton.

J'OSIEJIEH A. GUTHRIE, OF LITTLE ROCK, ARKANSAS, ASSIGNOR, BY DIRECT.AND MESNE ASSIGNMENTS, TO GUTHRIE-MITCHELL COMPANY, OF LITTLE RDCK,ARKANSAS,

A CORPORATION.

. Application filed July To all whom it may concern:

Be it known that l, Joel-Jen A. German, a citizen of the United States,residing at Little Rock, in the county of Pulaski, State oi Arkansas,have invented certain new and useful improvements in lnsulators;- and Ido herebydeclare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which itappertains to lnake and use the same.

This invention relates to insulators. and has for an object to provide adevice of this character that will permit ot slack being taken up in'thesupported wire from time to time without removing any of the parts ofthe device.

A second object of the invention is to provide an insulator having asiibstantially trusto-conical porcelain or like insulating elementformed of mating clamping halves, this element being surrounded by alnetallic clamping element which forms a protecting housing over theporcelain.

A still further object of the invention is t provide an insulatorinwhich the insulating element surrounding the trusteconical clampingmember snugly fits in theft tapered bore of a securing socket, a novelstaple like key being employed to lock the parts together, this keypermitting of the insulating element and the clamping element opening toa slight extent. when the key is partly withdrawn from its seat, so thatthe supported wire may be pulled by the line man and slack taken up.

With the above objects in view, the invention consists in the noveldetails of construction and the combination of parts hereinafter fullydescribed and claimed, it being understood that various modificationsmay be made in the form, proportion, and minor details of constructionwithin the scope of the appended claims.

In the accompanying drawings forming a part of this specification,Figure 1 is a front elevation of an insulator embodying my improvementsapplied'to a cross arm, Fig. 2 is a cross sectional View taken on theline 2-2 of Fig. 1, Fig. 3 isa detail perv-s spective view of theclamping element with, the key applied thereto, Fig. 4 1s a detailperspective view of the socket member, Fig.

5 is a front elevation of a modified form of insulator socket element.

Specification of Letters Patent.

2 4 1911. seria'ino. 640,169.

INSULATOR.

preferably constructed of metal and forms a protecting housing over theinsulating ele- .ment. Substantially, U-shaped hinges 18 "are arrangedon the end edges and connect the clamping member halves. *lVhen rockedopen, the clamping member halves permit of the porcelain insulatingmember halves moving slightly apart so that the conductor wire maybepulled through the insulating element from the smaller toward the largerend thereof and thus slack taken up in the wire from time to time. Thehalves of the clamping element are provided with pe- 'ripheral grooveswhich cooperate in forming an annular key slot 19 adjacent to the largerend of the clamping element.

A substantially squared socket element 20 is provided axially with atapered bore 21 which is adapted to snugly receive the frusto-conicalclamping element, and furthermore the socket element is provided with asaw kerf or slit, 22 which communicates with the tapered bore andpermits of Patented Apr. 2, 1912.

A substantially frustothe socket element being forced into tight- 7frictional engagement with the clamping element upon driving home of akey which is about tobe described. Formedron opposite sides of thesocket member are lugs 23 through which securing screws 24 are passed,these. screws beingengaged in the cross arm 10, it being understood thatthe latter is cut away to receive the socket element so that the topface of the socket element is flush with the top face oi the cross arm.

Formed in' the socket member onopposite sides of the slit 22 are taperedopenings 25; A substantiall U-sha key 26 is provided with taper legs 2which fit in the openings 25 and engage in the annular key slot 19 ofthe clamping element. Upon against the. porcelain insulating element andthe socket element is forced to bind tightly against the clamping memberso that all of the parts are rigidly locked to-\ gether. When it isdesired to take ,up slack in the supported wire the key is backed outslightly and permits of the halves of the clamping element opening to aslight 'extent and further permits of the porcelain insulating elementhalves moving apart so that the wire may be drawn forwardlytherebetween. taken up, and the lineman releases the wire, the tensionof the wire will cause the porcelain clamping element .to moverearwardly or toward the smaller end of the clamping element and theclamping element to move rearwar'dly or toward thevsmaller end of thesocket element. and in this manner all of the parts move into tightfrictional engagement with each other. The key is now driven home and asabove described clamps all the parts in rigid relative position.

I A modification of the clamp socket element is shown in Fig. 5. Thesocket element is designated by the number 28 and is formed as abovedescribed with the exception that the lugs 23 are dispensed with and thesocket element is equipped on one side with a spike 29 which is designedto When the slack has been be embedded in the head of apole or the like.Vhat is claimed is:

1. An insulator including a substantially frusto-conical elementformedof insulating material, and comprising mating halves, a

mating halves, a substantially frusto-conical clamping element formed ofmating halves surrounding said insulation element and provided with aperipheral key slot, a socket element provided with a tapered boreadapted to receive said clamping element, and provided with spaced keyopenings, and a substantially U-shaped key having legs engaged throughsaid openings and seated in said key slot.

In testimony whereof, I afiix my signature, in presence of twoWitnesses.

' JOSEPH A. GUTHRIE.

Witnesses: v

W. A. LAMB, J. W. STUBBS.

